68637990 has 32 divisors (see below), whose sum is σ = 165473280. Its totient is φ = 18221024.

The previous prime is 68637979. The next prime is 68638007. The reversal of 68637990 is 9973686.

It is a happy number.

It is a super-2 number, since 2×68637990² = 9422347342480200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1771 + ... + 11849.

It is an arithmetic number, because the mean of its divisors is an integer number (5171040).

Almost surely, 2^68637990 is an apocalyptic number.

68637990 is an abundant number, since it is smaller than the sum of its proper divisors (96835290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68637990 is a wasteful number, since it uses less digits than its factorization.

68637990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10316.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 68637990 is about 8284.8047653520. The cubic root of 68637990 is about 409.4380363665.

The spelling of 68637990 in words is "sixty-eight million, six hundred thirty-seven thousand, nine hundred ninety".